Spherical weight actuated toy



March 19, 1957 w. ,1. KOOISTRA, SR

SPHERICAL WEIGHT ACTUATED TOY Filed Oct. 14, 1954 2 She'ets-Sheet lINVENTOR. W/LL/AM d Ina/57AM, 5/2

March 19; 1957 w. J. KOOISTRA, SR 2,735,504

SPHERICAL WEIGHT ACTUATED TOY Filed Oct. 14, 1954 k 2 Sheets-Sheet 2 I*1 E a W 5a a *u d\ 42 9 3/ E 32 2 INVENTOR. 4 W/LL/4M J KOO/$2764, 51?.

United States Fatent O Thisinvention relates in general'to a mechanicaltoyoperated by spherical weights, and more particularly to a typel'thereof having an elevator which is raisedand then released by meansresponsive to the rotation of a member which is in turn rotated by saidsphericalweights.

It is a recognized fact that perpetual motion machines are physicalimpossibilities. However, machines which have characteristicslofperpetual motion combined with interesting movements have long beensought after because of their entertainment qualities, particularly forchildren; Among such toys are a great variety o'f mechanisms which areoperated by weights of various types. However, insofar as I am aware,none of' these mechanisms combines a rotary member with a verticallyreciprocab-le element whereby parts of the weights used to operate therotary member are automatically transferred from the :rotary member tothe vertically reciprocable element for re-utilization in rotating saidrotary member.

Accorclingly, a primary object of this invention is the provision of achildrens toy operated by'spherical Weights and soconstructed that aportion of the weights utilized in operating the toy are automaticallyreturned by a vertically reciprocable element coordinated with saidmember to a position where they can effect continued operation of saidtoy, thereby giving said toy the apparent characteristics of a perpetualmotion machine without, in

fact, being such.

A further object of this invention is the provision of a toy,' asaforesaidjwhich produces a considerable amount of relatively complicatedmovements in a manner which will intrigue and entertain smallchildrenand keep them occupied for long periods of time.

A further object of this'invention isthe-provision of a toy, asaforesaid, which is mechanical in operation and Which is operatedwithout any external force, other than the weight of said'sphericalweights being moved by the.

machine.

A further object of this inventionis the provision of a mechanical toy,as aforesaid, which is inexpensive to manufacture, "simple to operate,requires very little action by the person operating the toy and whichis, therefore,

an ideal toy for personswho are restricted in their movements.

Other objects and purposes of this invention will become apparent topersons familiar with this type of equip ment upon reading of thefollowing specification and examination of the accompanying drawings inwhich:

Figure l is a side elevationview of an apparatus embodying my invention.

Figure 2 is a top plan of such apparatus in a slightly differentposition.

Figure 3 is a fragmentary, sectional view taken along the line {IL-IIIof Figure 2 and rotated 180 degrees into an upright position.

Figure 4 is a sectional viewsubstantiallyas taken along .7

the line IV -IV ofFigure 1.

Figure 5 isa sectional view substantially as taken along the,lineV--V0f;Figure 4 androtated degrees clockwise.

Figure 6 is-an-enlarged'fragment of Figure 2tindicated by the cuttingline VI.-VI associated with Figure 5.

Figure 7 t is a sectional view taken along the line VIl-VII of Figure 6.

Figure 8 is, a. sectional view taken along the: line VIII VIII of Figure5..

Figure 9*is a sectional view taken alongthe line IX--IX of Figure 1 1.

In meetingthe objects and'purposes set forth above,

as well as others related thereto, I have provided a:

one receptacle onto said element for return to a position where they canagain be deposited into either of said receptacles. The otherdischarging receptacle is arranged to discharge its spherical weightnear the low point in itsrotational path. Thus, where two receptaclesare provided, half of the original charge of weights is automaticallyreturned; to the trough 17 by the toy.

For convenience in description, the terms upper, lower, left, right,front, rear and derivatives thereof are used herein with reference tothe toy it as appearing in Figure l. The terms inner, outer andderivatives thereof have reference to the geometric center .oftsaid toy.

Detailed construction As shown in Figures 1 and 2,the mechanical toy 10has a frame 111 comprised of a base or tray w having a side rail 21therearound. A pair of parallel, upright support posts 22 and 23(Figures 1, 2 and 4) are secured at their lower ends in any convenient,conventional manner .upon the tray l9 near the center thereof. The frontpost 23 is preferably disposed leftwardly of the the rear post 22 andhas a substantially vertical elevator guide 24 secured to the rightwardside thereof. The guide 24 is provided with a'vertical, undercut slot 27opening out of its righttside. In this particular embodiment, the guide24- extends above the support post 23 where its upper end engages andsupports the high end of the inclined trough 1'7. Said trough 17 maybe achannel member having a front section 33-which extends leftwardly anddownwardly from the uppcrtendlof the rail 24 and then curves around andreverses its direction by means of a. sloping rear section 39 disposedalongside of said front section 38. The lower or rightward end 37 of therear section .39 is supported upon the rear post 22 near the Thus, asappearing in Figure 2, the trough 17 has a U-shaped plan view. It willbe apparent upper end thereof.

the rotary member l2is mounted. Said shaft 31 is sup-' i ported near theotherend thereof by a bearing bracket, 32secured to,andextendingrightwardlyfrorri, the front Patented Mar. 19, i957 Thebracket 23 1s providedwith an upwardly opening notch 29 for supportingone end of a horizontalshaft 31 upontwhich-q 3 post 23 and having anotch 33. As shown in Figure 4, the notches 29 and 33 are co-axial andthe brackets 28 and 32 are on opposite sides of the member 12.

The rotary member 12 is, in this particular embodiment, comprised of acircular disk 34 co-axially supported upon the shaft 31 and releasablysecured thereto by means of a set screw 35 extending radially through ahub 36 secured to one side of said disk 34, as shown in Figure 5. Theperiphery of the disk 34 and the shaft 31 are preferably disposeddirectly below the lower end of the trough 17 and the rear section 39 ofsaid trough preferably extends for at least a short distance in therotational plane of said disk. The side walls of the disk 34 are spacedfrom the posts 22 and 23 and the shaft 31 is preferably provided withannular grooves engageable with the notches 29 and 33 in the bearingbrackets 23 and 32 to prevent axial movement of the disk 34 with respectto the bearing brackets.

As shown in Figures 1, 3, 4 and 5, the shaft 31 extends forwardly of thefront bracket 32 where it supports a gear 41 secured to the shaft 31 bythe radially disposed set screw 42. The gear 11, rack 44 and disk 34, aswell as the frame 11 and trough 17, may be fabricated from anyconvenient, conventional materials such as wood, metal or plastic. Theshaft 31 and bearing brackets 28 and 32 are advantageously, but notnecessarily made of metal. Said gear 41 rotates in a plane parallelwith, and passing through, the slot 27 of the guide 24 and has teeth 43which may be wire loops, as shown in Figure 4. The periphery of the gear41 is spaced from the guide 24 a sufficient distance to permit theinterposition of a vertically reciprocable rack 44 therebetween. Saidrack 44 has a pair of spaced T-shaped flanges 4-5 along one edgeslidably receivable within the slot 27 for controlling the verticalmovement of the rack 44. Said rack 44 has teeth 46 on the opposite edgethereof engageable with the teeth 43 of the gear 41 whereby rotation ofsaid gear 11 in a clockwise direction, as appearing in Figure 1, willeffect at raising of the rack 44. The gear teeth 43 are omitted from theperiphery of the gear 41 along approximately one third of itscircumferential length, which permits a release, and resulting drop dueto gravity, of the rack 4 after having been raised by interengagement ofthe gear and rack teeth. An elevator platform 47 is secured in anyconvenient, conventional manner upon the upper end of the rack 44 toprovide with said rack 44 the vertically reciprocable element 13. Saidplatform 47 may be provided with a low rail 48 around the edges thereofto retain thereon a spherical Weight 164. The platform 47 is shown insolid lines in its lowered position (Figure 1) and is shown in brokenlines 49 in its raised position. Rotation of the rotary member 12results in a corresponding rotation of the gear 41 thereby raising andlowering the vertically reciprocable element 13 during each revolutionof the rotary member 12.

The rotary member 12 is provided with a pair of receptacles 14 and(Figures 1, 4, 5, 8 and 9) which are preferably disposed ondiametrically opposite sides of the disk 34. As shown in Figures 4, 5and 8, the reloading receptacle 14 is comprised of a circumferentiallyelongated notch 51 in the periphery of the disk 34 having an arcuateinner wall 53 which ma as shown herein, be sloped axially of the disktoward the shaft 31. An arcuate bar 52 is disposed along the rearwardside of the notch 51 to retain the spherical weights 16 within saidnotch due to the slope in the wall 53 thereof. Thus, spherical weights16, such as marbles, discharged from the low end 3'7 of the trough 17will strike the wall 53 of the notch 51 and, due to the slope in saidfloor, move over against the bar 52 extending along said notch 51. Thewall 53 of the notch 51 also preferably slopes from the trailing end 54to the leading end 55 thereof with respect to the direction of rotationof said notch 51, which is clockwise as appearing in Figure 1. The depthof the notch 51 at said leading end 55 is approximately equal to thediameter of the spherical weights 16.

The weight guide means 18, which may be part of the receptacle 1d, iscomprised of a pair of guide bars 56 and 57 (Figures 4 and 5) secured atone end of each to the disk 34 substantially at the point intersectionof the leading end 55 of the notch 51 and the periphery of the disk 34.The rear guide bar 56 has an outwardly bowed part which extends fromsaid notch end 55 toward the trailing end 54 While curving frontwardlyto a point beyond the front side 58 of the disk 34. Said bar 56 thenextends parallel with said side 53 past the trailing end 54 of saidnotch 51 where it is secured to the disk 34. The front guide bar 57extends parallel with, and spaced frontwardly from, the rear guide bar56 to said point in front of said side 53. Thereafter, the front guidebar 57 continues to curve in a smooth are parallel with said disk 34toward said shaft 31 and is secured at its inner end 59 to the side 58of the said disk 34, about midway between the shaft 31 and the peripheryof the disk 34, in this particular embodiment. Thus, a spherical weight16, disposed adjacent to the leading end 55 of the notch 51 duringdownward movement of the notch, may move onto the parallel guide bars 56and 57 and, as the notch 51 moves upwardly, follow said guide bars untilsaid weight moves past said point after which it will be guided by thefront guide bar 57 and the adjacent front side 58 of the disk 34.

A loading chute 62 is secured to, and extends upwardly from, the frontbearing bracket 32 intermediate the front post 23 and the notch 33between the vertically reciprocable element 13 and the front side 58 ofthe disk 34. Said chute 62, which may be an integral part of the frontbracket 32 (Figures 3, 4 and 5) has its front edge disposed slightlyabove the lower, solid line position of the elevator platform 47 shownin Figure l, and slopes upwardly and rearwardly toward the disk 34adjacent thereto. Said chute 62 culves upwardly both at its leftward andrightward ends and is so disposed that the inner 59 of the bar 57 passesclose to the leftward receiving end 63 of the chute 62.

The curvature of the bar 57 and chute 62 is such that the sphericalweight will move with the rotation of the disk 34- onto the elevatorplatform 47. The gear 41 is so positioned upon the shaft 31 that itsteeth 43 will be disengaged from the rack teeth 46 just before the innerend 59 of the guide bar 57 discharges its spherical weight into theloading chute 62 and, therefore, in sufiicient time for the elevatorplatform 47 to reach its lower, solid line position shown in Figure 1.it will be apparent that the vertical position of the loading chute 62,the maximum inward extent of the bar 57, the amount of toothed surfaceon the gear 11 and the distance which the elevator platform 4-7 may bemoved by said gear 41 are all functions of each other which must becarefully worked out for any particular arrangement of the toy. However,it will be equally apparent that variations in these functions may bemade within the scope of this invention.

The discharging receptacle 15 (Figures 1 and 9) is comprised of acircumferentially elongated notch 66 having a substantially flat,straight inner wall 67 which intersects the periphery of the disk 34 atits leading end 68 and engages a trailing end wall 69 at its other end.A pair of substantially parallel retaining bars 71 and 72 extend betweenthe opposite ends of the notch 66 and are spaced laterally therefrom forreception of a spherical Weight 1.6 therehetween. As shown in Figure 9,a loop 73 of relatively stiff bar stock is pivotally supported upon thedisk 34- adjacent to the leading end 68 of the notch 66 for movementabout an axis parallel with the shaft 31 between the broken line andsolid line positions shown in Figure 1. Thus, a spherical Weight 16discharged from the lower end 37 of the trough 17 into the notch 66 willmove forwardly therealong as the disk 34 is rotated until it is receivedinto the loop 73 where it remains until said loop reaches the positionenemas approximately as shown in Figure 1 where the weight 16 will dropfrom the loop 73 into thetray 19; As the loop 73 passes beneath thetrough 17, itwill be moved back into thebroken line position 74 prior toengagement by another spherical weight 16. The loop 73 prevents earlydislodgement of the weight from the notch 66 and also moves the centerof gravity of the spherical Weight 16 a little furtheraway from theshaft 31. Thus, said loop 73 may under some circumstances be omittedprovided the notch 66 has some other, similar means of preventingdislodgement of the spherical weight from its leading erid until saidleading end reaches the position shownin Figure 1.

'As shown in Figures 5, 6, 7 and 8, a metering device 81 is mounted uponthe trough 17 near the low end 37 thereof, for the purpose ofdischarging one spherical weight 16 at a time from said trough uponappropriate actuation of the metering device by means on the disk 34.The metering device 81 is'comprised of an elongated lever arm 82pivotally'supported upon one side wall of the trough 17 near said end 37thereof, the other end of said lever" 82 extending rightwardly beyondsaid lower end 37. A crossbar 83 is secured to, and extendsperpendicularly from, the right end of, the lever 82 transverse of thetrough 17. A side bar 84 is secured to, andextends from, the free end ofthe cross bar $3 back toward the trough 17 substantially parallelwiththe lever 82.. The side bar 84 is spaced from the lever 82 adistance suiticient to permit a'spherical weight16 to pass therebetween.The cross bar 83 issutficiently close to the edge 85 of the trough bed86 when the lever 32 is in its lower position (Figure 7) to prevent asaid spherical weight 16 from passing therebetween. A downwardly andforwardly extending foot 37 is secured to the lever 82 at a point nearto the edge 85- of the trough bed 86 and extends toward the center ofsaid trough bed 86.

When the lever arm 32 is in said lower position (Figures 6 and 7), thefoot 87rests upon the trough bed 86 and does not obstruct the passage ofthe spherical weights 16 along the trough 17. However, when the rightend of the lever 82 is in its raised position (Figure 8) weight 16:: isreleased from thetrough 17 and the foot 37 intercepts the sphericalweight 16]) immediately following the spherical weight 16a. Lowering ofthe lever 82 permits weight 16b to take the position adjacent tothe'cross bar 83 just vacated by weight 16a. i i

A lift rod 88 is pivotally supported at its upper end upon the arm 82adjacent to the cross bar 83 whichlimits the forward pivotal movement ofsaid rod to a position substantially perpendicular to the arm 82., asshown in Figure 7. The lower end of said" rod 38 is provided witharightwardly curving hook 91which'extends substantially parallelwith andadjacent to the rear side 92 of the disk 34- (Figures 5 and S). A pairof pins 93 and 94 are secured to, and extend from, the disk rear side 92near to the notches 51 and 66, respectively, and are spaced slightlyrearwardly of the leading ends 555 and 68 thereof. and so located thatthey will engage the lower end of the rod 88 during rotation of the disk34 and cause said rod,

hence said arm 82, to be raised upwardly to a position permitting therelease of the first spherical weight 16a from the end of the trough 17(Figure 8) into a receptacle 14 or 15,respectively.

Operation In a preferred embodiment of my invention, the mechanical toyis arranged so that the rotary element 12 will rotate in a clockwisedirection when viewed from the front side thereof as appearing in Figurel. A plurality of spherical weights 16, such as the spheres 16a, 16b and16c shown in Figures 6, 7 and 8, are loaded into the inclined U-shapedtrough 17, which trough may be transparent. The spherical weights may becolored marales to add to the attractiveness, but must be substantiallySaid pins are equi-distant from the shaft 31 6 uniform in weight anddiameter, said diameter being limitedby the sizeof the trough'17, thereceptacles 14 and 15 and the vertically reciprocable element 13.

The operation of the my 11) preferably commences with the loadingreceptacle 14' in the top position, the discharging receptacle 15in thebottom position and the pin 93 associated with the notch 51 disposedleftwardly of the lift rod 88, as appearing in Figure 11. At thismoment, the vertically reciprocable' element 13 is in its lowerposition, as shownin solid lines in Figure l, with a spherical weight1681 disposed thereon. The open space in the gear'teeth 43'on the gear41 is disposed adjacent to the rack44 'with said gear teeth positionedto engage the rack teeth 46 upon slight clockwise rotation (Figure 1').The disk 34 is manually rotated in said clockwise direction until thepin 93 engages the rod 83 and thereby raises the lever arm SZ from itsFigure 7 position to its Figure 8 position to release the sphericalweight 16a into the notch 51. spherical weights 16 are released from thelower end 37 of the trough '17 over the downwardly moving portion ofsaid disk 34. The spherical weight 16a moves toward, and engages, theleading end 5'5 of the notch 51 thereby causing the disk 34 to berotated in a clockwise direction, as appearing in Figure 1. As the notch51 approaches and reaches the lower end of its rotational path, thespherical weight 16a moves from the inner wall 53 onto the leading endwall 55. and then upon the guide bars 56 and 57. i

About when the notch 51 is completely inverted and thespherical weight16a moves onto the guide bars 56 and 5701? guide means 18, the pin 94associated with the notch 66 engages the rod 88 thereby causing themetering device 81 to release the spherical weight 16b into the notch 66in substantially the same manner as the spherical weight 16d wasreleased into the notch 51. The momentum of the disk 34 causes it tocontinue its rotation until the spherical weight 16b moves along theinner wall 67' of notch 66 tothe leading endtid thereof. The loop 73 ismoved from its broken line position 74 into its solid line position(Figure 1) to receive the spherical weight 16b therewithin and the disk34 is rotated by the weight 16b. During thernovement of thenotch 66 fromits high position to its low position, the spherical weight 16a movesfirst alongthe parallel guide bars 56 and 57 and then along and betweenthe guide bar 57 and the front side 58 of the disk 34 until the saidweight 16a rolls off the inner end 59 of the bar 57 into the leftwardend 63 oftheloading chute 62. The loading chute 62 then directs thespherical weight into and upon the elevator platform 47 which is in itslowered. position.

It will be observed that during the initial movement of the notchSl fromits Figure 1 position around to a position where the spherical weight16a is deposited, as above recited, into the elevator platform 37, saidelevator platform has made a complete vertical reciprocation from itssolid line position (Figure l) to its broken line position at 49 andreturn. When, in the raised, broken line position, the weight 16d isdeposited into the upper end of the trough 17 whereupon it rolls towardthe lower end 37 of said trough. Accordingly, during the rotation of thedisk 34 from its Figure 1 position where it receives the 'weight 16a tothe position where said spherical weight 16a is deposited upon theplatform 47, the spherical weight 16d is removed from the platform andsaid platform is returned to its lowered position ready to receive saidspherical weight 16a. When the loop 73, hence the notch 66, reaches itslower position (Figure l), the spherical weight 16b disposed therein isdischarged into the tray 19 and must, therefore, be manually lifted intothe trough 17. i This completes one cycle of operation of my toy.

It will be seen that each spherical weight discharged from the trough1'7 into the receptacle 14 will be returned by the guide bars 56 and S7of the guide means 18 and by In this particular embodiment, the

the vertically reciprocable element 13 to the trough 17. Each sphericalweight discharged into the receptacle 15 will be deposited into the tray39, this particular receptacle being provided for the primary purpose ofrotating the disk 34. As long as the weights 16 discharged from thenotch 66 into the tray 19 are manually returned into the trough 17, themechanical toy 10 will continue to operate indefinitely. As in the caseof the initial cycle of operation, additional cycles commence with theelevator 47 in its lowered, solid line position (Figure 1) and thereceptacle 14 in its high position (Figure 1) with the pin 93 about toengage the rod 88 for the purpose of tripping the metering device 81 andthereby releasing a spherical weight 16 into the notch 51.

It should be apparent from the above disclosure of my invention thatdetails in mechanical structure may be varied substantially providingonly that there is a rotary member having at least two receptaclesthereon, one of which acts primarily to rotate the rotary member whereasthe other moves the spherical weight deposited therein from a trough tothe platform of a vertically reciprocable element which in response torotation of the rotary member lifts the spherical Weight back into saidtrough.

Accordingly, although a particular, preferred embodiment of my inventionhas been disclosed herein for illustrative purposes it will beunderstood that modifications thereof which lie within the scope of suchinvention are fully contemplated unless specifically stated to thecontrary in the appended claims.

I claim:

1. A toy operable by a plurality of spherical weights, comprising: aframe and an inclined trough supported thereon; a rotary member mountedupon said frame for rotation entirely by said weights about a horizontalaxis beneath the low end or" said trough; a vertically reciprocableelement supported upon said frame near said memher for receiving aweight from said member; means responsive to rotation of said member forraising said element to a position adjacent to the upper end of saidtrough and depositing said weight in said upper end; first receptaclemeans on said member for receiving a Weight from said low end of saidtrough and discharging same near the bottom of its rotary path ontomeans other than said element; second receptacle means on said memberfor receiving a weight from said low end of said trough and dischar ingsame upon said element below said position, said member continuing torotate as long as said receptacles receive weights.

2. A toy operable by a plurality of spherical weights, comprising: aframe an inclined trough supported thereon; a rotary member mounted uponsaid frame for rotation entirely by said weights about a horizontal axisbeneath the low end of said trough; a vertically reciprocable elementsupported upon said frame near said member for receiving a weight fromsaid member; means responsive to rotation of said member for raisingsaid eleent to a position adjacent to the upper end of said trough anddepositing said Weight in said upper end; a pair of spaced receptaclemeans on said member for releasing and receiving weights from said lowend of said trough, one receptacle discharging its weight near thebottom of its rotary path onto means other than said element and theother receptacle discharging its weight upon said element below saidposition, said member rotating automatically as long as said receptaclesreceive weights of adequate mass.

3. A toy operable by a plurality of spherical weights, comprising:frame; a rotary member having a pair of spaced receptacles on itsperiphery and mounted upon said frame for rotation entirely by saidweights about a horizontal axis; a vertically reciprocable elementsupported on said frame near to said member for receiving a weight fromsaid member; means responsive to a partial rotation of said member forraising and releasing said element; an inclined trough on said framewith its high end adjacent to one position of said element for receivingsaid weight from said element and its low end above said member on thedownwardly moving side thereof for discharging said weight into one ofsaid receptacles; means actuated by said member for releasing a Weightinto each receptacle as it passes the low end of said trough, onereceptacle discharging its Weight near the bottom of its rotational pathonto means other than said element; and a weight guide extending fromthe other receptacle to another, lower position of said element fordischarging a weight from said other receptacle onto said element, saidmember continuing to rotate automatically as long as said receptaclesreceive weights from said trough.

4. A toy operable by a plurality of spherical weights, comprising: anupright frame; an inclined trough supported on said frame; a circularmember supported upon said frame for rotation by said weights about ahorizontal axis disposed below the low end of said trough, said memberhaving a pair of substantially diametrically disposed, receptacles onits periphery for receiving weights from said trough; an elevatorsupported upon said frame near one side of said member for substantiallyvertical movement; means responsive to rotation of said member forraising and lowering said elevator, during less than a full rotation ofsaid member, between a low position and a high position adjacent thehigh end of said trough, a said weight being received by said elevatorin its low position from one said receptacle and being discharged bysaid elevator in its high position into said trough; a metering deviceactuated by said member for releasing one weight into each receptacle asit passes said low end of said trough, the Weight being discharged fromthe other receptacle near the bottom of its rotational path; a weightguide extending from the one receptacle to said low position of saidelevator, said guide having one part mounted upon said member and theother part mounted upon said frame.

5. A toy operable by a plurality of spherical weights, comprising: anupright frame; an inclined trough on said frame; a circular membersupported upon said frame for rotation by said weights about ahorizontal axis disposed directly below the low end of said trough, saidmember having a pair of diametrically disposed receptacles on theperiphery thereof for receiving Weights from said trough; an elevatorand means supporting same upon said'frame near one axial side of saidmember for vertical reciprocation; means responsive to a partialrotation of said member for raising said elevator from a low position toa high position, adjacent to the high end of said trough, and releasingsame, a said weight being received by said elevator in its low positionfrom one said receptacle and being discharged by said elevator in itshigh position into said trough; means on said trough actuated by saidmember for releasing a weight into each receptacle as it passes said lowend of said trough, the other receptacle discharging its weight near thebottom of its rotational path; and a weight guide extending from the onereceptacle to said low position of said elevator, said weight guidehaving one part mounted upon said aixal side of said wheel and anotherpart mounted upon said frame adjacent to said axial side.

References Cited in the file of this patent UNITED STATES PATENTS1,260,664 Gregory Mar. 26, 1918 1,261,691 Bunkley Apr. 2, 1918 1,631,016Craven May 31, 1927

